‘Twas DDT nearly killed the beast

December 20, 2007

 

This University of Buffalo South Campus resident keeps a watchful eye over the nesting box in the Mackay tower that was custom-designed by UB facilities staff. - See more at: http://www.buffalo.edu/news/news-releases/arts-and-culture.host.html/content/shared/university/news/news-center-releases/2010/04/11203.html#sthash.hqz74P1J.dpuf

This University of Buffalo South Campus resident keeps a watchful eye over the nesting box in the Mackay tower that was custom-designed by UB facilities staff. – See more at: http://www.buffalo.edu/news/news-releases/arts-and-culture.host.html/content/shared/university/news/news-center-releases/2010/04/11203.html#sthash.hqz74P1J.dpuf

It was DDT that nearly did in the peregrine falcon, not habitat destruction, not hunters, not egg collectors.

Dr. [Tom] Cade, who said he had been fascinated by falcons from childhood and who did his Ph.D. dissertation on the peregrine and gyrafalcon in Alaska, recalled that at first the peregrine’s plight was mistakenly attributed to overdevelopment, molestation by falconers, collection of its brown speckled eggs by admirers and wanton killing by people who simply did not like falcons. But at a conference at the University of Wisconsin in 1965, experts realized that the crash of falcons was a worldwide problem, and, as Rachel Carson suggested in ”The Silent Spring,” DDT was probably the main culprit.

DDT is an organochloride compound that breaks down into DDE, a highly persistent chemical that is stored in the fat of animals that consume it, especially predators like peregrines that are at the top of the food chain. DDE interferes with the deposition of calcium in the shells of the birds’ eggs, leaving them too fragile to survive incubation by females weighing two or three pounds.

Remarkable story of the dedication of one ornithologist, a successful program to revive an endangered species, and serendipity with a happy ending, in an often-overlooked article by science writer Jane Brody at the New York Times, February 15, 2000.

Junk science advocates claim that DDT did no serious damage to birds; the story of the peregrine falcon indicates that DDT was the major culprit in a worldwide decline of raptors. (This is direct refutation of claims by Steven Milloy and the late Gordon Edwards.)

Apart from the rebuttal points, Brody’s story tells how scientists work, how they make mistakes and recover, and how luck plays a huge role in some endeavors.

Peregrine falcons were delisted from the endangered species list in 2000, due largely to the success of Tom Cade’s captive breeding program, coupled with a decline in DDT in the wild after DDT use was restricted.


Rising at Buffalo News: Carson was right

December 14, 2007

Gerry Rising writes a column for the great newspaper, The Buffalo News (which is part of Warren Buffet’s Berkshire/Hathaway holdings).

Rising wrote a column praising Rachel Carson near her birthday last spring, and got a lot of comment. On November 25 his column dealt with the criticisms of Carson, drawn from comments to his earlier column. Rising’s view is quite middle of the road, and points the way to why the critics of Carson seem so shrill to me.

A single quote (interestingly it was repeated in two of the communications I received) will indicate the response that bothers me: “Rachel Carson is responsible for more deaths than Pol Pot.” Sadly, that statement represents the carefully mounted and continuing attack on Carson.

DDT played an extremely important disease-controlling role in World War II, but consider the following:

• Its supporters credit DDT with eliminating malaria in this country but that disease was already largely gone here by 1939 when Hermann Mueller discovered that the chemical was lethal to insects.

• An international campaign led by Fred Soper to eliminate malaria through use of DDT that indeed saved thousands of lives had largely run out of steam by the early 1960s when “Silent Spring” was published. Mosquitoes were building up resistance and geographical factors particularly in African countries, made spraying extremely difficult. Between 1960 and 1989 deaths from malaria actually decreased when treatment shifted from insecticides to medicine.

• Carson never did call for banning DDT and other pesticides in “Silent Spring.” She wrote, “It is not my contention that chemical insecticides must never be used. I contend that we have allowed these chemicals to be used with little or no advance investigation of their effect on soil, water, wildlife and man himself.”

• The 1972 Environmental Protection Agency ban of DDT in America was instituted 10 years after “Silent Spring” was published and eight years after the author’s death from cancer. Although Carson’s influence was evident, the act cites substantial scientific evidence of DDT’s adverse effects on wildlife and increased insect resistance.

• The focus of “Silent Spring” was on the indiscriminative use of insecticides for agricultural purposes, not on its use as a public health measure. Carson critics have made much of the World Health Organization’s 2006 approval of DDT, but that approval is “under strict control and only for indoor residual spraying,” thus exactly the kind of use Carson supported.


More DDT poisoning

December 13, 2007

[Time passes and internet links die, expire, or otherwise fall into the black hole of irrelevancy. Alas. Rachel Carson is still right.]

Sometimes, when people make gross errors, they get caught. They apologize, or they mumble, and they move on.

A few times, when people make gross errors, they revel in it. Rather than admit the error, they make it again. They say it wasn’t an error. They repeat it, time and again, as if two wrongs make a right, or as if 126 wrongs make a right.

We caught Caosblog repeating some bad stuff about Rachel Carson, and false, good stuff about DDT, and false claims that eagles were not endangered by DDT. We called ’em on it. [But the blogger appears to have deleted the response. It was that good.]

Whoooee! This is the result.  Note the list of unquestioning links to other stuff on the web.  (Yeah. “Milton Fillmore.”  Probably not reading comprehension error so much as rant-blindness.)

If there is anything crazy and mean about Rachel Carson, it’s probably in that list. If there is any wild and insane claim about the safety of DDT, it’s in that list. If there were any accurate information, it would be a miracle. (Well, actually there’s some good information in the National Geographic story about malaria, but I doubt the blog writer bothered to read it.) The blog links to all the Lyndon Larouche crazies, all the tobacco lobbyist crazies, and acts as if such manure is golden.

Very little of it is accurate. Most of the material so far out to lunch, it’s not even wrong. The person who runs the blog sent me an e-mail saying my comments are no longer welcome there, because of the tone of my remarks. Too many links to too much refutation of blog’s points, I gather — too much real information!

DDT poisoning clearly is damaging, with effects far beyond anything Rachel Carson ever predicted.

This is the venal, vicious spirit that Sen. Tom Coburn defends with his hold in the U.S. Senate on honors for Mrs. Carson. This is the spirit with which the anti-Rachel Carson movement rails at environmentalists about malaria in Africa, while holding back funding for anti-malaria projects in Africa.

Woody Allen had a line in Annie Hall that may be appropriate: “There’s nothing wrong with you that couldn’t be cured with Prozac and a polo mallet.”

Reason and evidence won’t do it now. When someone starts out arguing that eagles were not threatened with extinction by the poison that a thousand studies verified was doing them in, you can’t reason them back to reality.

Below the fold: At the second outlet of that blog, conversation carried for a while, though not necessarily so for enlightenment. In 2015, I thought it a good idea to capture some of that.

Read the rest of this entry »


DDT no silver bullet; environmentalists, medical care not monsters

December 13, 2007

Paul Driessen wrote a book, Eco-Imperialism, that in essence blames environmentalists for every case of malaria in Africa since 1962. It is possible, that overreaction to environmental concerns by African governments and by Africans in the path of malaria parasites has indeed caused some delay in decreasing malaria infections. I have not seen any convincing evidence to make that case.

But it is untrue that environmentalists advocate policies intended to hurt Africans. It is untrue that DDT is a silver bullet that meanie environmentalists refuse to let African governments use — environmentalists do not have the power to tell African governments what the governments can or cannot do. Plus, it’s unfair to the point of gross distortion to blame environmentalists for the many problems which still exist that prevented the eradication of malaria 40 years ago and continue to frustrate efforts to reduce the frequency and mortality of the disease.

I assume Driessen is well-intentioned, though I have no first hand information about his motivations.

With that assumption, let me ascribe to simple error the many problems of his recent column for an on-line magazine perhaps aptly named spiked.

Driessen calls for an “all-out war on malaria.” That would be good.

But then he accuses environmentalists of standing in the way of such a war.

False blame calling cures not a single case of malaria, nor kills a single malaria-carrying mosquito. If Driessen wishes to fight malaria, there are a lot of people who would like to help. We can start to fight malaria, any time. [More after the fold.]

Read the rest of this entry »


Benefits offset by infant deaths? DDT no panacea

December 10, 2007

Cover of August 2008 Emerging Infectious Diseases from the CDC, featuring: Jan Steen (c. 1625–1679). Beware of Luxury (c. 1665). Oil on canvas 105 cm x 145 cm. Kunsthistorisches Museum, Vienna, Austria

Cover of August 2008 Emerging Infectious Diseases from the CDC, featuring: Jan Steen (c. 1625–1679). Beware of Luxury (c. 1665). Oil on canvas 105 cm x 145 cm. Kunsthistorisches Museum, Vienna, Austria

Weighing risks against benefits for DDT spraying is very difficult. Anti-environmentalists and junk science purveyors claim millions of deaths from DDT’s not being sprayed.

They never tell us about the kids DDT could kill.

When we combine data from North America on preterm delivery or duration of lactation and DDE with African data on DDT spraying and the effect of preterm birth or lactation duration on infant deaths, we estimate an increase in infant deaths that is of the same order of magnitude as that from eliminating infant malaria. Therefore, the side effects of DDT spraying might reduce or abolish its benefit from the control of malaria in infants, even if such spraying prevents all infant deaths from malaria.

*   *   *   *   *

The prohibition of DDT use for malaria control was probably not the sole cause of increasing malaria burden in sub-Saharan Africa (40), and thus DDT will probably not be the sole cure for the malaria epidemic there. Insecticide-treated bed nets, widely used in African households to prevent mosquito bites, are effective (41,42). Synthetic pyrethroid insecticides, cheaper than DDT, are available (43,44). Where DDT is used, all infant deaths, plus birth weights and the duration of lactation, should be counted. Some thought could also be given to a formal trial, since the risk and benefit calculations apply to individual dwellings, and an effective alternative, namely bed nets, is available. (Chen A, Rogan WJ. Nonmalarial infant deaths and DDT use for malaria control. Emerg Infect Dis [serial online] 2003 Aug. Available from: URL: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3020610/)

Go read it — the issue of spraying or not is complex, and this study talks only about infant deaths (there may be greater life saving among older children and adults that would make the infant deaths a trade off policy makers would consider, for example). It’s a study from the Centers for Disease Control, part of a continuing series of technical publications from CDC titled Emerging Infectious Diseases. This series tracks much of the work done to fight malaria world wide.

This is valuable information. It shows the issue is much more complex that just “spray or don’t spray.” It’s also information that JunkScience.com hopes you will not pursue. It’s real information, and it refutes the junk science claims from that site.

(In June 2004 the denialists at Africa Fighting Malaria had a letter published complaining about this paper’s findings, but offering no data in rebuttal.)

Wikimedia Commons image of Jan Steen's painting,

A more clear image from Wikimedia Commons of Jan Steen’s painting, “Beware of Luxury.” Click on cover of journal at top of post for a discussion of this painting and how it relates to infectious diseases.


Peregrine falcons — ‘100 things about DDT #77’

December 8, 2007

Another in an occasional series that analyzes “100 Things You Need to Know About DDT,” a junk science publication by former tobacco lobbyist Steven Milloy.

Here’s a note from Audubon a while ago (August 2004) (emphasis added):

Winged Tonic

For those dispirited by the notion that humanity has doomed itself to a lonely, sterile future in a world increasingly bereft of wild creatures, there is no tonic more curative than the peregrine falcon. Today, on cliffs, bridges, and city buildings nationwide, young peregrines are strengthening their wings. Within a few weeks, those wings will propel them at speeds near 250 mph, enabling them to kill birds as large as great blue herons, mostly by impact. City aeries are frequently monitored by TV cameras, and you can watch the progress of the hatchlings on your computer or television. (Do an Internet search to find the monitored aerie nearest you.) Before World War II the peregrine was among the planet’s most successful species, breeding on every continent and many mid-ocean islands, from the Arctic to as far south as Cape Horn. When University of Wisconsin biologist Joseph Hickey surveyed eastern peregrines in 1942, he found 350 breeding pairs. In 1963, after two decades of DDT use, he found none. But in 1972 the Environmental Protection Agency banned DDT, and soon an alliance of federal agencies, conservationists, and private groups was sponsoring captive breeding and the “hacking” of young peregrines into the wild. The recovery goal had been 631 breeding pairs in the United States and Canada. By 1999, when the peregrine was taken off the Endangered Species List, there were at least 1,650.

Compare this with Milloy’s claim #77:

The decline in the U.S. peregrine falcon population occurred long before the DDT years.

[Hickey JJ. 1942. (Only 170 pairs of peregrines in eastern U.S. in 1940) Auk 59:176; Hickey JJ. 1971 Testimony at DDT hearings before EPA hearing examiner. (350 pre- DDT peregrines claimed in eastern U.S., with 28 of the females sterile); and Beebe FL. 1971. The Myth of the Vanishing Peregrine Falcon: A study in manipulation of public and official attitudes. Canadian Raptor Society Publication, 31 pages]

Here are some potential problems:

Eggs of peregrine falcon, crushed by parent due to thin shells caused by DDT. Photo copyright Steve Hopkin, www.ardea.com

Eggs of peregrine falcon, crushed by parent due to thin shells caused by DDT. Photo copyright Steve Hopkin, http://www.ardea.com

1. Milloy offers no real citation to Hickey in 1942. The quote would be impossible to track down. Why is Milloy hiding sources, being so coy?

2. While Milloy doesn’t quote Hickey directly, Milloy’s citation of Hickey implies that Hickey’s work supports Milloy’s point. But when we read what Hickey found, according to Audubon, it contradicts Milloy’s point. If Hickey found only 170 nesting peregrines in 1940, and 350 in 1942, clearly that suggests the peregrines were doing very well, more than doubling their nests in two years. Milloy claims peregrines were on the decline, but from what little we have, it looks like their populations were rocketing up prior to DDT. Hickey developed a great reputation for his work revealing the bad effects of DDT; how is it that Milloy has found the only instant ever recorded where Hickey discovers no harm? I suspect Milloy has doctored the data, and not that he’s made a grand discovery of a missing Hickey manuscript.

3. A general decline of raptors prior to DDT does not refute the evidence that DDT killed embryoes, killed hatchlings before they could fledge, and killed fledglings before they could mature. DDT wasn’t the sole cause of the decline of peregrines, nor eagles, nor brown pelicans, but DDT was the major barrier to their recovery. The history of the war against eagles, for example, is rather well documented, as is the development of the wild lands eagles use as habitat. Eagle populations started to decline at the latest when Europeans started to settle North America. Those pressures have never gone away. But after the eagle was protected from hunting in 1918, and then with a tougher law in 1940, the decline was not ended. After 1950, eagles essentially stopped reproducing. This made recovery impossible, and this was the problem DDT caused. When DDT spraying stopped, peregrine falcon populations started to rise, and so did eagle and brown pelican populations, among others.

I have been unable to find a single study that does not corroborate the claim that DDT and its daughter products were hammering the reproduction of predator birds in North America — nor have I found a single study that says the damage has ended. Where does Milloy find any evidence to support his implied claim that DDT was not responsible? It’s not in the citations he offers.

There may be more on this issue coming. So far, nothing Milloy has said against a DDT ban, or in favor of DDT, has checked out to be truthful from the citations he gives, nor from any other source. There are 109 points in his diatribe; I’ve only researched fewer than 20 in any depth.

Other posts pointing out Milloy’s errors:

Peregrine Falcon

Peregrine falcon – “Mr. Milloy, you wouldn’t tell fibs about what’s killing my babies, would you?”


Amory Lovins, Rocky Mountain Institute: ‘Don’t do this’

November 29, 2007

Steven Milloy won’t like this. It’s a parable, based on a true story, about why we shouldn’t willy-nilly increase DDT spraying, anywhere. Amory Lovins tells it quickly, and well.

So in this tranquil but unwavering spirit of applied hope, let me tell you a story.

In the early 1950s, the Dayak people in Borneo had malaria. The World Health Organization had a solution: spray DDT. They did; mosquitoes died; malaria declined; so far, so good. But there were side-effects. House roofs started falling down on people’s heads, because the DDT also killed tiny parasitic wasps that had previously controlled thatch-eating caterpillars. The colonial government gave people sheet-metal roofs, but the noise of the tropical rain on the tin roofs kept people awake. Meanwhile, the DDT-poisoned bugs were eaten by geckoes, which were eaten by cats. The DDT built up in the food chain and killed the cats. Without the cats, the rats flourished and multiplied. Soon the World Health Organization was threatened with potential outbreaks of typhus and plague, which it would itself have created, and had to call in RAF Singapore to conduct Operation Cat Drop–parachuting a great many live cats into Borneo.

This story–our guiding parable at Rocky Mountain Institute–shows that if you don’t understand how things are connected, often the cause of problems is solutions. Most of today’s problems are like that. But we can harness hidden connections so the cause of solutions is solutions: we solve, or better still avoid, not just one problem but many, without making new ones, before someone has to go parachuting more cats. So join me in envisioning where these linked, multiplying solutions can lead if you apply and extend what you’ve learned and take responsibility for creating the world you want. Details of this business-led future will be described this autumn in a book my team and I are now finishing, called Reinventing Fire.

[Here, used to be a Google Video of that part of the speech. O tempora, O mores! Is the format even available anymore?  Below, video of a 2011 commencement speech, with the same parable near the beginning.]

Amory Lovins is founder, president and Chief Scientist with the Rocky Mountain Institute.  This speech, from August 2007, can also be viewed at RMI’s site, where the full text is also available.

“Effects of DDT in Borneo,” a flow chart showing the need for “Operation Cat Drop,” the UN-sponsored parachuting of cats into Borneo after a DDT-caused disastrous avalanche of events. From ActionOutdoors.org


DDT works! (When used carefully, in IVM, and sparingly)

November 20, 2007

Discover Magazine’s site has a solid story on DDT and malaria, “Can a maligned pesticide save lives.” Among other things, the article notes that Rachel Carson was scientifically accurate in her cited concerns that DDT was killing birds, and in fact later research of more than 1,000 peer-reviewed papers has born out her worries, and provided even greater evidence of damage.

Cover of November 2007 Discover Magazine, featuring an article on DDT's continuing use in the fight against malaria, and vindicating Rachel Carson's research citations with regard to injuries to birds.

Cover of November 2007 Discover Magazine, featuring an article on DDT’s continuing use in the fight against malaria, and vindicating Rachel Carson’s research citations with regard to injuries to birds.

The article details how DDT is used in integrated vector management (IVM), where pesticides are sparingly and carefully used to prevent their target pests from evolving resistance and immunity.  DDT’s abuse had bred widespread resistance in mosquito populations in Africa and other malaria-endemic locations, forcing the World Health Organization to abandon its ambitious program to eradicate malaria in a program dependent on DDT working for at least a year.

Steven Milloy and the Usual Suspects and Comrades in Junk Science, in the War on Science at AEI and CEI will start their distortions of the Discover article any moment now . . . three, two, one . . .


Another carnival of DDT

November 18, 2007

One of the clues that someone is financing a public relations campaign for DDT and against care for the environment is the way “news” keeps popping out about the benefits of DDT, though there is no natural process for making such news in back of the stories.

We old PR flacks recognize that without the push from an agent, these stories wouldn’t get written.

Just over a month ago there was a flurry of stories about how DDT was “effective” even after mosquitoes developed immunity to it, because it repels mosquitoes, too — even though that wasn’t what the researchers concluded, and that wasn’t the major thrust of the research article.

We also saw a Hoover Institute fellow call for DDT to be used to fight the spread of West Nile virus, though no public health official called for such action, though there is no particular need for such a drastic change in policy, and despite the fact that DDT spraying for the mosquitoes that carry West Nile is one of the least effective means of killing them (DDT is not a larvacide, and larvacides are called for to combat West Nile).

This month? No real news, but the American Enterprise Institute, which nominally is pitched at promoting business interests, issued a new report recycling all the old canards, calling for increased use of DDT in Africa to fight malaria, despite already expanded use, and despite a lack of call from health officials to spray more DDT.

Here’s how it looks on the internet:

November 5, 2007 – Wall Street Journal opinion piece by AEI’s Roger Bate, over the years one of the most ardent salesmen of DDT as the solution to nearly every problem, so long as it bashed environmentalists. WSJ notes the piece is a shorter version of the AEI report.

November 1, 2007 – TCS piece by AEI’s Roger Bate, complaining generally about environmentalists.

Random DDT stuff, some of which may turn into separate posts:


Praying to DDT for a miracle that DDT cannot work

November 11, 2007

Evolution denier Ray Bohlin is in Liberia telling the Liberians their salvation lies with DDT, at least in fighting malaria. Wholly apart from the theological problems of elevating a chlorinated hydrocarbon killer to the level of idolic deity, DDT can’t solve the many problems that conspire to keep Liberia in the grip of DDT as a killer of children and pregnant women.

What an odd conflict of faith and science. Bohlin is a Christian. His strong faith in DDT is a double puzzle.

[And, what is it with all this denial? Creationist/IDist/evolution deniers tend heavily to be HIV deniers as well, and global warming deniers — now DDT deniers? Have they all had close encounters of the third kind, too? Is it a virus? Is it a cult?]

Fighting malaria in Africa requires a concentrated, integrated plan that provides appropriate medical care to cure any human who contracts malaria, thus breaking a key link in the malaria cycle. Malaria kills children under 5 and pregnant women in larger percentages than other people. Bohlin correctly notes that malaria kills, and that the disease disrupts the nation’s economy. But his recommendation that Liberians increase DDT use, in the absence of an integrated pest management plan, is a prescription for dashed hopes at best, and disaster at worst.

Bohlin seems to urge junk science. DDT offers significant dangers, which Bohlin seems blithely to ignore.

Why won’t DDT help much in the fight against malaria?

Wholly apart from the inherent problems of DDT — mosquitoes develop immunity, or already are immune; DDT kills beneficial insect and arachnid predators of malaria vectors, so the mosquitoes come back in geometrically increased numbers; DDT kills the food fish of people who live on fish; DDT kills reptile, mammal and bird predators of mosquitoes, so the mosquito population roars back with increased killing efficiency — DDT cannot solve the other problems that play a greater role in frustrating the fight against malaria. DDT doesn’t treat the disease once humans catch it; DDT is just one, small tool to prevent infection, and perhaps not the most effective. Read the rest of this entry »


100 things about DDT: Dissecting #10

November 8, 2007

This is another in an occasional series of posts dissecting the claims made by JunkScience purveyor Steven Milloy’s “100 things you should know about DDT.” What I find in this list is a lot of deception, misleading claims, and general unjustified vitriol. In this post I’m looking at Milloy’s point #10.

Milloy said:

10. Rachel Carson sounded the initial alarm against DDT, but represented the science of DDT erroneously in her 1962 book Silent Spring. Carson wrote “Dr. DeWitt’s now classic experiments [on quail and pheasants] have now established the fact that exposure to DDT, even when doing no observable harm to the birds, may seriously affect reproduction. Quail into whose diet DDT was introduced throughout the breeding season survived and even produced normal numbers of fertile eggs. But few of the eggs hatched.” DeWitt’s 1956 article (in Journal of Agriculture and Food Chemistry) actually yielded a very different conclusion. Quail were fed 200 parts per million of DDT in all of their food throughout the breeding season. DeWitt reports that 80% of their eggs hatched, compared with the “control”” birds which hatched 83.9% of their eggs. Carson also omitted mention of DeWitt’s report that “control” pheasants hatched only 57 percent of their eggs, while those that were fed high levels of DDT in all of their food for an entire year hatched more than 80% of their eggs.

Considering Carson’s careful citing of studies on all sides of the issue, and her use of sources dating back 30 years and more, it would be difficult for her to have “represented the science of DDT erroneously.” Carson got the science right. Milloy doesn’t even get the quote of Carson right, however, deleting her main point, and editing it to set up a straw man argument which misleads unwary readers.

Carson represented the science faithfully. Milloy simply dissembles in his accusation that she got it wrong.

In fact, Carson offered more than 50 pages of citations to studies, virtually everything available on DDT and the other chemicals she wrote about, up to the time of publication. Carson had started working on the issue in 1948, and worked almost solely on the work that became Silent Spring between 1959 and the book’s publication. None of the studies she cited has been retracted. Most of the studies were determined to be accurate in follow-up studies.

I discuss this at some length, below the fold. Read the rest of this entry »


Fighting malaria with reason

October 29, 2007

We can beat malaria without DDT; we can’t beat malaria without bednets.

Editorial from BMJ (née British Medical Journal?) points out that bednets really work, and they work better when distributed free of charge.  Nets cost about $5.00 each, but in nations where a good day’s pay is about $1.00, charging for them merely means they won’t be purchased and can’t be used.

Time for Sen. Tom Coburn, R-Oklahoma, and Steve Milloy, to listen to reason, stop bashing Rachel Carson, and start fighting malaria.

Update, February 2009; the original link seems irrecoverable; see also this research, BMJ 2007;335:1023 ( 17 November), doi:10.1136/bmj.39356.574641.55 (published 16 October 2007


Michael Crichton hysterical for DDT

October 28, 2007

Ever notice how hysteric people claim they are normal, and everyone around them is hysterical? Case in point: Michael Crichton promoting DDT to students while taking leave of his science sense, at Cleveland High School in Reseda, California, in 2005:

Crichton surely knows better.

1. DDT is a known carcinogen for animals. Denialists’ wishes to the contrary, serious cancer fighters list DDT as a suspected human carcinogen.

2. Rachel Carson’s citations are solid, and stand up well today. Nothing Crichton publishes in his novels is so carefully footnoted. Carson offered more than 50 pages of references to the scientific publications that provided the evidence for what she wrote. President Kennedy appointed a panel of top scientists to investigate her claims, the President’s Science Advisory Committee. The headline in The Christian Science Monitor for their report, in May 1963, was “Rachel Carson vindicated.” The panel recommended limiting the use of DDT, much as it is limited today. It’s completely unacceptable for Crichton to claim against all the evidence that Carson’s science was bad. Repeated studies and new studies since 1962 confirm her science firmly.  [Update for World Malaria Day 2015:  That State Department document has gone missing; see press reports of the PSAC Committee here, and the full text of the report, “Use of Pesticides,” here.  A version of MIchael J. Friedman’s article on Rachel Carson, referred to in the first link in this paragraph, can be found here.]

3. Every “ban” on DDT, since the first in 1970 in Europe, has included an out clause to allow use to fight malaria. Crichton seems to have missed out on the facts: DDT ceased to be effective due to the rise of immunity and resistance in targeted mosquito populations, and DDT was never implemented against mosquitoes in other places, due to political reasons unrelated to any environmental concern.

4. DDT was never the panacea against malaria, since it does nothing to cure the disease in humans and it does nothing to fight the parasites themselves. DDT can’t make up for poverty that prevents people from building suitable homes or putting screens in windows, or buying mosquito netting for their children. DDT can’t work if people don’t drain mosquito breeding places around their homes.

5. Eggshell thinning studies were repeated dozens hundreds of times, and DDT and its daughter products are clearly implicated as the culprits in the fatal thinning of eggshells. It is telling that eggshell thicknesses have increased as DDT levels in residual form in tissues of birds has decreased. Crichton also omits more damning evidence: Studies showed that DDT affected the viability of eggs wholly apart from the eggshell problems. DDT kills chicks in the egg.

6. Malaria did not “explode” as a result of the discontinuation of DDT. Over more than a decade, malaria rates rose because the campaign to eradicate malaria aimed for an impossible goal, and overspraying of DDT and political instability hampered efforts to fight malaria.  Moreover, DDT was never banned for use against malaria In many nations where malaria exploded, DDT was the weapon of choice to fight it.  DDT often doesn’t work.  In Mexico, for example, DDT use was never stopped — DDT use has been constant since 1946.  And yet, Mexico has been fighting an increase in malaria for over a decade.  Only when Mexico adopted Rachel Carson’s recommendations did they begin to roll back the disease.

7. Crichton gets it right when he notes that the EPA “ban” on DDT included a waiver for use against malaria. But why does he forget that in every other paragraph?

8. Crichton mischaracterizes the Persistant Organic Pollutants (POPs) Treaty, saying that it bans DDT worldwide in the face of knowledge that such a ban was wrong. The treaty specifically allows continued production and use of DDT to fight disease. (Newer links to the POPs Treaty, also known as the Stockholm Convention, here.)

9. 30 million people may have died of malaria in a period Crichton doesn’t define, but it is incorrect to say they died as a result of DDT bans. DDT was still used in the countries where many of those people died (DDT has been in constant use in Mexico since 1946, for example, and malaria has come roaring back there as in other places). DDT was never used in several African nations where governmental instability prevented the creation of programs to fight disease. DDT can’t change governments. The global effort to “eradicate” malaria smashed into the parasites’ development of immunity to several drugs used to treat it in humans. DDT has never been effective in those cases. Crichton misattributes the deaths. (It’s nice he doesn’t cite the more absurd 500 million deaths figure that some people point to.)

10. Crichton’s claim that a lot of Americans “just don’t care” about malaria in Africa, because it harms people of color, is an interesting claim, but his implication that those people are environmentalists, and not the Bush administration which held up funding for malaria fighting, makes his concerns smell hypocritical.

While indicting hysteria against DDT, Crichton invokes hysteria in favor of the chemical. One wishes his science views were not so clouded by his politics.


Reason makes progress in malaria/DDT discussions

October 28, 2007

It’s one ray of sunshine in a sky of darkened clouds, but here’s evidence that reason occasionally overcomes bias in discussions about malaria and DDT: “More on Malaria – And Good Karma For Bill Gates,” by Scott Kirwan, at Dean’s World.

That’s good, because the nattering nabobs of negativism still pull out their long knives for Rachel Carson unjustly, unwisely, and invoking all the old junk science and hoaxes in other venues, like Collecting My Thoughts, and “DDT: Behind the Scare Stories,” at the noble-intentioned but temporarily-off-the-tracks Hawaii Reporter.

DDT is still a deadly poison, and still not a panacea against malaria. It’s nice to see reason having sway, probably due to the efforts of the Gates Foundation and its allies.


Fighting malaria in Cameroon

October 23, 2007

Interesting on-line news publication, The Entrepreneur, carries on-the-ground report of Cameroon’s new anti-malaria program:  Integrated pest management with a touch of DDT.

While the treatment of complicated malaria now requires a cocktail of sulphate drugs, Cameroon has reinstituted Dichlorodiphenyltrichloroethane, DDT for the prevention of malaria transmission. The organic chemical, DDT, to which the malaria vector was formally thought to be resistant, has been recommended as an effective insecticide against mosquitoes. According the principal officer, “that DDT was kept out for a long time could have given room for mosquito’s resistibility to be naturally eradicated, hence, making it again a good insecticide.” The treatment and proper use of mosquito nets is being recommended as a preventive measure.

[Update, 2018: No one noticed I’d spelled “Cameroon” incorrectly?]